Abstract:

Compass navigation system has increasingly played more and more important roles in the military and civil navigation. Although the signal of compass using a spread spectrum technique makes it own a certain degree of interference margin, it still can be affected sensitively by interference due to its weak signal power. The diversity of interference makes anti-jamming difficulty by just using either time domain filtering technology or space domain filtering technology. Among all interferences, broadband interference is most influential and most difficult to overcome. To solve these problems, we use Space-Time adaptive processing technique in this article and it is more useful comparing with time domain filtering technology or space domain filtering technology or frequency domain filtering technology as it increases the degrees of freedom without increasing the number of antenna. However different antenna array has different influence using Space-Time adaptive processing technique. So in this article we have discussed the space-time responses of different antenna array and improvement factor of each antenna array. The simulation shows that circular antenna array plays better in anti-jamming process. It could provide a theoretical foundation in the design of BeiDou receiver.

Key words: compass navigation system, Space-Time adaptive processing technique, antenna array, improvement factor